package com.whale.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import com.whale.constant.MessageConstant;
import com.whale.context.BaseContext;
import com.whale.dto.UserLoginDTO;
import com.whale.dto.UserUpdateDTO;
import com.whale.entity.User;
import com.whale.exception.LoginFailedException;
import com.whale.mapper.UserMapper;
import com.whale.properties.WeChatProperties;
import com.whale.service.UserService;
import com.whale.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {


    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {

        //获得openid
       String openid=getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid==null){
           throw new LoginFailedException(MessageConstant.LOGIN_FAILED);

        }
        //判断当前用户是否为新用户

        User user = userMapper.getByOpenId(openid);

        //如果是新用户，自动完成注册
        if(user == null){
             user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);

        }
        //返回这个用户对象
        return user;
    }

    /**
     * 更新用户信息
     * @param userUpdateDTO
     */
    @Override
    public void updateUser(UserUpdateDTO userUpdateDTO) {
        User user = new User();
        BeanUtils.copyProperties(userUpdateDTO,user);
        user.setId(BaseContext.getCurrentId());
        userMapper.update(user);
    }

    /**
     * 调用微信接口服务，获得当前微信登录用户的openId
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String,String > map=new HashMap<>();
        map.put("Appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json= HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject= JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
